diff --git a/crypto/src/math/ec/custom/sec/SecT131Field.cs b/crypto/src/math/ec/custom/sec/SecT131Field.cs
new file mode 100644
index 000000000..df75dfcd7
--- /dev/null
+++ b/crypto/src/math/ec/custom/sec/SecT131Field.cs
@@ -0,0 +1,274 @@
+using System;
+using System.Diagnostics;
+
+using Org.BouncyCastle.Math.Raw;
+
+namespace Org.BouncyCastle.Math.EC.Custom.Sec
+{
+ internal class SecT131Field
+ {
+ private const ulong M03 = ulong.MaxValue >> 61;
+ private const ulong M44 = ulong.MaxValue >> 20;
+
+ public static void Add(ulong[] x, ulong[] y, ulong[] z)
+ {
+ z[0] = x[0] ^ y[0];
+ z[1] = x[1] ^ y[1];
+ z[2] = x[2] ^ y[2];
+ }
+
+ public static void AddExt(ulong[] xx, ulong[] yy, ulong[] zz)
+ {
+ zz[0] = xx[0] ^ yy[0];
+ zz[1] = xx[1] ^ yy[1];
+ zz[2] = xx[2] ^ yy[2];
+ zz[3] = xx[3] ^ yy[3];
+ zz[4] = xx[4] ^ yy[4];
+ }
+
+ public static void AddOne(ulong[] x, ulong[] z)
+ {
+ z[0] = x[0] ^ 1UL;
+ z[1] = x[1];
+ z[2] = x[2];
+ }
+
+ public static ulong[] FromBigInteger(BigInteger x)
+ {
+ ulong[] z = Nat192.FromBigInteger64(x);
+ Reduce61(z, 0);
+ return z;
+ }
+
+ public static void Multiply(ulong[] x, ulong[] y, ulong[] z)
+ {
+ ulong[] tt = Nat192.CreateExt64();
+ ImplMultiply(x, y, tt);
+ Reduce(tt, z);
+ }
+
+ public static void MultiplyAddToExt(ulong[] x, ulong[] y, ulong[] zz)
+ {
+ ulong[] tt = Nat192.CreateExt64();
+ ImplMultiply(x, y, tt);
+ AddExt(zz, tt, zz);
+ }
+
+ public static void Reduce(ulong[] xx, ulong[] z)
+ {
+ ulong x0 = xx[0], x1 = xx[1], x2 = xx[2], x3 = xx[3], x4 = xx[4];
+
+ x1 ^= (x4 << 61) ^ (x4 << 63);
+ x2 ^= (x4 >> 3) ^ (x4 >> 1) ^ x4 ^ (x4 << 5);
+ x3 ^= (x4 >> 59);
+
+ x0 ^= (x3 << 61) ^ (x3 << 63);
+ x1 ^= (x3 >> 3) ^ (x3 >> 1) ^ x3 ^ (x3 << 5);
+ x2 ^= (x3 >> 59);
+
+ ulong t = x2 >> 3;
+ z[0] = x0 ^ t ^ (t << 2) ^ (t << 3) ^ (t << 8);
+ z[1] = x1 ^ (t >> 56);
+ z[2] = x2 & M03;
+ }
+
+ public static void Reduce61(ulong[] z, int zOff)
+ {
+ ulong z2 = z[zOff + 2], t = z2 >> 3;
+ z[zOff ] ^= t ^ (t << 2) ^ (t << 3) ^ (t << 8);
+ z[zOff + 1] ^= (t >> 56);
+ z[zOff + 2] = z2 & M03;
+ }
+
+ public static void Square(ulong[] x, ulong[] z)
+ {
+ ulong[] tt = Nat.Create64(5);
+ ImplSquare(x, tt);
+ Reduce(tt, z);
+ }
+
+ public static void SquareAddToExt(ulong[] x, ulong[] zz)
+ {
+ ulong[] tt = Nat.Create64(5);
+ ImplSquare(x, tt);
+ AddExt(zz, tt, zz);
+ }
+
+ public static void SquareN(ulong[] x, int n, ulong[] z)
+ {
+ Debug.Assert(n > 0);
+
+ ulong[] tt = Nat.Create64(5);
+ ImplSquare(x, tt);
+ Reduce(tt, z);
+
+ while (--n > 0)
+ {
+ ImplSquare(z, tt);
+ Reduce(tt, z);
+ }
+ }
+
+ protected static void ImplCompactExt(ulong[] zz)
+ {
+ ulong z0 = zz[0], z1 = zz[1], z2 = zz[2], z3 = zz[3], z4 = zz[4], z5 = zz[5];
+ zz[0] = z0 ^ (z1 << 44);
+ zz[1] = (z1 >> 20) ^ (z2 << 24);
+ zz[2] = (z2 >> 40) ^ (z3 << 4)
+ ^ (z4 << 48);
+ zz[3] = (z3 >> 60) ^ (z5 << 28)
+ ^ (z4 >> 16);
+ zz[4] = (z5 >> 36);
+ zz[5] = 0;
+ }
+
+ protected static void ImplMultiply(ulong[] x, ulong[] y, ulong[] zz)
+ {
+ /*
+ * "Five-way recursion" as described in "Batch binary Edwards", Daniel J. Bernstein.
+ */
+
+ ulong f0 = x[0], f1 = x[1], f2 = x[2];
+ f2 = ((f1 >> 24) ^ (f2 << 40)) & M44;
+ f1 = ((f0 >> 44) ^ (f1 << 20)) & M44;
+ f0 &= M44;
+
+ ulong g0 = y[0], g1 = y[1], g2 = y[2];
+ g2 = ((g1 >> 24) ^ (g2 << 40)) & M44;
+ g1 = ((g0 >> 44) ^ (g1 << 20)) & M44;
+ g0 &= M44;
+
+ ulong[] H = new ulong[10];
+
+ ImplMulw(f0, g0, H, 0); // H(0) 44/43 bits
+ ImplMulw(f2, g2, H, 2); // H(INF) 44/41 bits
+
+ ulong t0 = f0 ^ f1 ^ f2;
+ ulong t1 = g0 ^ g1 ^ g2;
+
+ ImplMulw(t0, t1, H, 4); // H(1) 44/43 bits
+
+ ulong t2 = (f1 << 1) ^ (f2 << 2);
+ ulong t3 = (g1 << 1) ^ (g2 << 2);
+
+ ImplMulw(f0 ^ t2, g0 ^ t3, H, 6); // H(t) 44/45 bits
+ ImplMulw(t0 ^ t2, t1 ^ t3, H, 8); // H(t + 1) 44/45 bits
+
+ ulong t4 = H[6] ^ H[8];
+ ulong t5 = H[7] ^ H[9];
+
+ Debug.Assert(t5 >> 44 == 0);
+
+ // Calculate V
+ ulong v0 = (t4 << 1) ^ H[6];
+ ulong v1 = t4 ^ (t5 << 1) ^ H[7];
+ ulong v2 = t5;
+
+ // Calculate U
+ ulong u0 = H[0];
+ ulong u1 = H[1] ^ H[0] ^ H[4];
+ ulong u2 = H[1] ^ H[5];
+
+ // Calculate W
+ ulong w0 = u0 ^ v0 ^ (H[2] << 4) ^ (H[2] << 1);
+ ulong w1 = u1 ^ v1 ^ (H[3] << 4) ^ (H[3] << 1);
+ ulong w2 = u2 ^ v2;
+
+ // Propagate carries
+ w1 ^= (w0 >> 44); w0 &= M44;
+ w2 ^= (w1 >> 44); w1 &= M44;
+
+ Debug.Assert((w0 & 1UL) == 0);
+
+ // Divide W by t
+
+ w0 = (w0 >> 1) ^ ((w1 & 1UL) << 43);
+ w1 = (w1 >> 1) ^ ((w2 & 1UL) << 43);
+ w2 = (w2 >> 1);
+
+ // Divide W by (t + 1)
+
+ w0 ^= (w0 << 1);
+ w0 ^= (w0 << 2);
+ w0 ^= (w0 << 4);
+ w0 ^= (w0 << 8);
+ w0 ^= (w0 << 16);
+ w0 ^= (w0 << 32);
+
+ w0 &= M44; w1 ^= (w0 >> 43);
+
+ w1 ^= (w1 << 1);
+ w1 ^= (w1 << 2);
+ w1 ^= (w1 << 4);
+ w1 ^= (w1 << 8);
+ w1 ^= (w1 << 16);
+ w1 ^= (w1 << 32);
+
+ w1 &= M44; w2 ^= (w1 >> 43);
+
+ w2 ^= (w2 << 1);
+ w2 ^= (w2 << 2);
+ w2 ^= (w2 << 4);
+ w2 ^= (w2 << 8);
+ w2 ^= (w2 << 16);
+ w2 ^= (w2 << 32);
+
+ Debug.Assert(w2 >> 42 == 0);
+
+ zz[0] = u0;
+ zz[1] = u1 ^ w0 ^ H[2];
+ zz[2] = u2 ^ w1 ^ w0 ^ H[3];
+ zz[3] = w2 ^ w1;
+ zz[4] = w2 ^ H[2];
+ zz[5] = H[3];
+
+ ImplCompactExt(zz);
+ }
+
+ protected static void ImplMulw(ulong x, ulong y, ulong[] z, int zOff)
+ {
+ Debug.Assert(x >> 45 == 0);
+ Debug.Assert(y >> 45 == 0);
+
+ ulong[] u = new ulong[8];
+ // u[0] = 0;
+ u[1] = y;
+ u[2] = u[1] << 1;
+ u[3] = u[2] ^ y;
+ u[4] = u[2] << 1;
+ u[5] = u[4] ^ y;
+ u[6] = u[3] << 1;
+ u[7] = u[6] ^ y;
+
+ uint j = (uint)x;
+ ulong g, h = 0, l = u[j & 7]
+ ^ u[(j >> 3) & 7] << 3
+ ^ u[(j >> 6) & 7] << 6;
+ int k = 33;
+ do
+ {
+ j = (uint)(x >> k);
+ g = u[j & 7]
+ ^ u[(j >> 3) & 7] << 3
+ ^ u[(j >> 6) & 7] << 6
+ ^ u[(j >> 9) & 7] << 9;
+ l ^= (g << k);
+ h ^= (g >> -k);
+ }
+ while ((k -= 12) > 0);
+
+ Debug.Assert(h >> 25 == 0);
+
+ z[zOff ] = l & M44;
+ z[zOff + 1] = (l >> 44) ^ (h << 20);
+ }
+
+ protected static void ImplSquare(ulong[] x, ulong[] zz)
+ {
+ Interleave.Expand64To128(x[0], zz, 0);
+ Interleave.Expand64To128(x[1], zz, 2);
+
+ zz[4] = Interleave.Expand8to16((uint)x[2]);
+ }
+ }
+}
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